Pulverizing or grinding mill.



E. H. CALLAWAY.

PULVERIZING 0R GRINDING MILL.

APPLICATION FILED MAB..1B, 1907.

Patented Dec.21,1909.

6 SHEETS-SHEET 1.

W/TNESSES E. H. CALLAWAY.

PULVERIZING 0R GRINDING MILL.

APPLICATION FILED MAR. 18, 1907.

Patented Dec. 21

e SHEETS-SHEET 2.

D U un DG DE DD DD u u V /NvE/vmfr y I 1 Arrow/.5y

W/ TNE SSE C E. H. CALLAWAY. PULVBRIZING 0R GRINDING MILL. APPLICATION FILED MAR. 18. 1907. 944,073, Patented Dec. 21, 1909.

SSHEETS-SHBET 3.

INVENTO/ ZJ/JM A TTOHNEY W/TNESSES E. H. GALLAWAY.

PULVBRIZING 0R GRINDING MILL.

APPLICATION FILED MAB. 18, 1907.

Patented Deo. 21, 1909.

6 SHEETS-SHEET 4.

////////////./ l l l I f /NVE O? l BY l /1 ed ATTORNEY E. H.-0ALLAWAY.

PULVBRIZING OR GRINDING MILL. APPLICATION FILED MAR. 18,`1907. 944,073-, Patented Dec. 21, 1909.

6 SHEETS-SHEET 5.

E. H. CALLAWAY. PULVBRIZING R GRINDING MILL.

, APPLICATION FILED MAB. 1a, 1907.

Patented Dec. 21, 1909. y 6 SHEETS-SHEET 6.

A Tron/VE y UNITED sTATns PATENT; OFFICE.

EDWARD H. CALL'AWAY, 0F WESTKFIELD, NEW JERSEY, ASSIGNOR TO THE AMERICAN CLAY MACHINERY COMPANY, F BUCYRUS, OHIO, A `VCIORPORA'JION OF vOHIO.

PULVERIZING 0R GRINDING MILL.

. Specification of Letters Patent. Patented Dec; 21, 1909.

AApplication 1ed- March 18, 1907. Serial No. 362,835.

tion and combinations of parts to be hereinsurfaces, as will later appear, said plate be- 110 y To all whom :it may concern:

Be it known that I. EDWARD H. CALLA- after described and then recited in the WAY, a citizen of the United -States of claims. America, and a resident of Westfield, county In the accompanying drawings, Figure 1 5 of Union, State of `New Jersey, have invented is a top-plan view, partially broken away, 60

certain new and useful Improvements in of a grinding or pulverizing mill constructed Pulverizing o1' Grinding Mills, of which the in accordance with the invention, Fig. 2 is a following 1s a specification. side elevation, partly in section, Fig. 3 is an This invention relates to grinding or pulend elevatiomlpartly in section, Fig. 4 is an verizing'mills, and particularly to mills of enlargpd plan of the outer screen portion of 65 this description su'ch as are used to pulverize 'the pI n, with parts removed, Fig. 5 is a' or grind clay and similar substances and 'section on line 5 5, of Fig. 4, Fig. 6 is an employed in brick-making and kindred arts. enlarged plan view of one of the sections of The invention has among its objects to the screeninosurface, Fig. 7 is a section on provide a. mill in which the use of heavy and line 7 7, Fig. 6, Fig. 8 is an enlarged view 70 cumbersome grinding rolls, or mullers, actof the bearing foiwthe pan, Fig. 9 is a transing merely by gravity on thesubstance to be verse section of Fig. 8, Fig. l0 is a top-plan ground, is done away with, and the -same view of lthe` base in which the pan-carrying result attained by lighter means. shaft is journaled, and Fig. 11 is a side A further object yof the invention is to elevation, partly in section, of Fig. 10. 75 furnish a vconstruction in which the pres- In the drawlngs A denotes the masonry sure between the opposing grinding usurfaces l bed for the mill, which comprises, for exam-r may be regulated as desired and 1n an imple, upright parallel walls 15 and 1,6, upon proved manner. Y A which is seated a -cap-sha ed base B of cast The invention also contemplates the' pro- .metaL Seec Fig. 11V.' ,-)Sai base is provided 80 vision of an improved arrangement of the with a centralvertical shaft-bearing 18, as grinding surfaces whereby the'clay or other shown in Figs. 3, l0 and 11,- and at its cormaterial may be readily supplied to said -ners Withupright flanges 19 having bolt grinding surfaces, and. inwhich this maholes 19y bg which it is bolted to the bed by terial is screened immediately afterhaving means of olts 19. The base Bis further 85 been supplied to said surfaces, 4the material provided upon its u per surface with an which is ground sufficiently then passing annular groove 20, t e function of which through the screen or sieve while that which will appear later,l and with radial reinforcis still too coarse returned to the grinding ing ribs 21 extending outwardly therefrom. surfaces and ground until. it will,v pass Radial reinforcing ribs 22 are also formed 90` through the screen. upon the under surface of the base and eX- Theinvention also aims to furnish a'contend to the central bearing 18. One side struction in which the pan carries one of .of the base is provided with an opening 23, the bearing surfaces and is rotated in order to accommodate the drive shaft and gearing. 40 to grind the material, this rotation also pro- Rotatable in the bearing 18 of the base B 95 ducing automatically the screening of the 1s an upright shaft 24 which has keyed thereground material. to at its upper end a rotary pan `C mounted Further objects of the invention are to to rotate on the base. Said pan is of circular provide an improved form of rotary pan; to shape 'and comprises a central imperforate mount such pan .in an improved manner; to web 25, preferably of cast metal, `which is 100 provide simple and eiiiciently operating so fixed to` the shaft 24 that the latter is heldl means for returning the lumpy or coarse. in lts verticalposition; and an outer screen-` clay r or. other material, from the screenportion 26, the particular construction of portion of the pan to its grindingsurface; which will be hereinafter described. At the 504 to furnishmeans for keeping the openings outer upper portion of the web 25 there is 105 lof the screen clear; and to provide means provided a shallow, relatively wlde, annular for discharging the ground material from groove or seat in which. is seated a wide flat beneath the sieve. plate or ring 28 of hard metal, which forms With these endsk inview, the invention the wearing :plate or one of the grinding consists in the novel features of construcin preferably a seglnental rin-g of a suitf ab e number of se ments, say, elght for example. The pan (ag is rotated by means of a large bevel-gear 29 keyed to the upright shaft 24`beneath the base B and which engages a smallbevel-gear 30 mounted on the end of a horizontal driving-shaft 31 journaled in the masonry bed and extending through the opening 2 3` in the side of the base. Upon the driving-shaft 31 a pulley 32 is mounted, whereby the shaft ma be rotated by a belt driven from a vsuitab e source of power, this pulley being clutched and unclutched from the driving shaft by means of These standards are provided at their lowery ends with laterally-extending portions 36,

also preferably T-shaped in cross-section, which rest by their flat faces on the masonry and are provided -at their ends with upright flanges37 whereby they are bolted to corre-v flanges 38 at the corners of "thespondin base B y means of bolts 3 9, as shown Fig. 2. Each standard is bolted to the masonry by' means of bolts 40 passing through the base-web at'opposite-sides of the outwardly extending flange jof the upright portion. Beams'41` connect the` members of eachlpair of standards 35 that are mounted -on the same masonry wall. Said beams rest above the up er ends of the standards by means of cus ioning springs 42v arranged in sockets at the upper ends of the standards and each has journaled'therein at its interreferably beveled on' by means of boltsv mediate or middle portion, a grinding wheel,

or muller, W, bearing on the wearing plate 28 `of the pan Cl These wheels differ greatly fron ordinary mullers\as no w commonly used in this art inasmuch as they4 are relatively'very light in weight and have comparatively narrow grinding surfaces. Furthermore, their grinding surfaces do not cooperate witheach other, but with the wearing plate or ring of the pan, said surface of the mullers which are formed by the oute flanges, or ringspbeing of substantially the same width as said grinding ring. 'The two wheels bear against said ring at diametrically oppositepoints, as shown..

The heavy weight of the mullers now in use has beenthought Vessential to secure the i l requisite pulverizin or grinding action; but

I secure as good an vbetter results by-the use -of the li ht-weight mullers which are carried by aided and augmented by the springs bearing thereon as will now be explained.. The

proper functioning of the mill when such very light grinding elements are employed,

eavy beams 41 whose weight. is

is produced by means of strong helical follower springs; by which the pressure between the grinding surfaces may be readily,

adjusted required. These springs, denoted by reference character 45, act directly on the supporting beams 41 for the mullers,

there being preferably four springs for each adjusted by ineans of 4a nut 48 threaded on `the stein at-its upper lend. In this manner the springs are causedvto force the beams downwardly, overcoming the resistance ofthe cushioning springs 42, thus forcing. the mullers WV against the grindingsurface of the pan with the required degree of sure. By the arrangement described this pressure may be made very great and is equalized: or equipoised, to exert the same amount of .leverage on both ends of each beam, the muller axles serving as a fulcrum `therefor. l f

It is apparent that the standards 3 5 must be of such height that Whfen the grinding -wl1eels are pressed against the rotary horizontal. grinding surface of the pan, the beams do not contact directly with the upper ends of the standards. v

The beams 41 may b'e constructed in va variety of` ways, and in one or more pieces; but in the example illustrated in the draw-` ing, each beam 41 is made in "two longitudinal sections of an j lar cross-section, each of which is bulge laterally at its inbetween the latter and collars 47 prestermediate portlon, as indicated at 49,1 to

accommodate the corresponding grinding wheel or muller NV, the shaft 43 of which is journaled between -thesaid sections in .a

bearing 50 carried by said bulged portions at their lower parts. The removable parts 51 of each bearing are disposed at the under" surface ofthe beam and may be readily unbolted, whereby the wheel may be easily removed and replaced, it being merely n`eces sary-to remove the said lower part of the bearing. The upright Hanges ofthe beamsections are bolted togetherA throughout the distance from the bulged portions to their ends by means of bolts 52, andi-he lower horizontal anges of the sections meet to form-a bearing 'surface-to rest on the cush. ioning springs 42. Angular depending brackets 5,3 formed ntegralwith the beamsections adiacent their ends slide on the iny angles to the angular brackets 53,

ner faces of the standards 35 and guide each beam vertically, meanwhile .imparting greater rigidity to the construction.

The beams or beam-sections 41 are also provided with integral angular brackets or depending brackets 53x which are at rightl and are in contact with the opposing faces of the members of each pair of standards 35, as shown in Fig. 2, said angular brackets 53having the function of keeping said standards 35 pro erly spacedapart, as shown. It is to be urthermore noted in this connection that the standards 35 are connected together by horizontal cross-bars 111", which will be hereinafter referred to and which carry fthe scrapersf vIn this way, by means of the beams 41- which are provided with thev brackets 53 and 53., and also by means of the cross-bars 111x all arranged in combination with the standards .35, a very solid, compact and rigid arrangement is provided.

The particular construction of the pan C will now be described. As before stated,-

said pan comprises a central web portion 25 which isi keyed to the shaft 24, and an` Said portion com-f outer screen-portion 26. prises a circular main frame having an outer 7rim 55 and an inner rim 56 and radial connecting strips 57 between said-rims, as shown in Figs. 4 and 5. Said-frame is divided diametrically into two parts which are bolted ,together by bolts .58.passing through the adjacent strips 57 of the two parts.

Set over each part of the frame defined between" the inner and outer rims and two adjacent cross-strips 57 is a screen-section 60, one of which is clearly shown in detail in Figs. 6 and 7. These 'sections are divided from each other radially of the pan and are formed of frames 61, the straight side edges of which meet overthe` strips 57. Said frames are removably7 positioned onthe pan frame by means of ugs 62 formed on the strips 57, as shown in Figs. 4 and 5, said lugs engaging in seats or recesses in the frames 61. Extending across the small section-frames 61 are-cross-strips 63, and set in the former and supportedon said crossstrips are screen-sheets 611, preferably made of perforated sheet-metal, as shown. These sheets vor plates1 are provided with downwardly turned edges riveted or otherwise suitably secured to the section frames 61, as shown in Fig. 7, the upper surface of said plates lying Hush with those of 'said frames.

The cross-strips 63 support the plates 64 attheirmiddle part and prevent their bending or buckling under ordinary conditions. The

lso

screen-portion 26 of the pan is detaehably secured to the web 25 lbyI mans of a ring 65 applied to the under surface ofthe inner rim 56 of the main screen frame. Said ring (i5-tis beveled, as shown inFig. 5, and fits' lover the correspondingly beveled periphery' of the web 25,l as shown in Fig. 3. Said frame is freely movable vertically with respect to said web, but these parts are locked.

together in horizontal direction, so that the former will be rotated with the latter, by

means of lugs 66 on the web entering `re- 4screening surface are divided into sections,

repairs can be easily and economically made. The parts may/,also be veryreadily assembled and the pan made very light. The pan is provided at its edge with an upright rim (38 by which ythe material is confined. This rim is preferably constructed of sections bolted together and secured to the outer rim of the main screen frame, as shown.

, The upper surface of the screen portion 26 is engaged by fixed Scrapers 110 carried by brackets 111 detachably `lixed to horizontal cross-bars 111* connecting the upright standards 35. These Scrapers are curved and disposed obliquely to the radius of the lpan C and cause the material to be pushed inwardly toward the grinding surface and under the muller WV. The brackets 111 are v provided lat their inner ends with a series of transverse slots 112 by which the Scrapers may be adjustably bolted thereto. Rotary brushes 113 o'f wire, wood,-or other suitable material have their bristles lengagingl the Aopenings or perforations in the screen-seclthe brushes on the fine material, and the brushes also clean'the surface of the screen sections, and prevent the openings therein from becoming clogged up with the clay or other material. n

The arrangement of the pan, by which it is rotatably mounted on the/base B, will now be described. As previously mentioned, the

base is provided upon its upper surface with l A depending annular flange 73 formed on the under surface-of said web coperates with the outer ange of the groove 20 preventing. the entrance of dust and the like to v tion rollers 77 which roll on the inner flange. 21x of the groove 20, as shown in Figs. 8

and 9, whereby said ring is freely and rotatably supported. -The ring is,A preferably made in sections 78 bolted together by bolts 79. Between the rollers 74 and 77 on the same spindle areinterposed washers 80. The rollers are removably held on their spindles by means of Cotter-pins 81, there being washersA 80X interposed between theends of the rollers .and thejcotter-pins. 'A

By the provision of the rollers 'between I the balls, the :friction is greatly reduced, as

the balls do not bear directly against each other and as they rotate' in the same tion.4 The rollers 74 of course rotate in the opposite direction. The' ring' 75 travels freely on the flange 21x of the base by means of its rollers 76. The ends of the spindles 76 are screwed into the4 ring 75, as shown, and are held thereinv and prevented from working loose by means of dowel pins 81X. This feature of the ball and rollerpbearing combination is one of the important features of the present invention.'l

Lubricant is fed to the balls and their raceways from a lubricaiitcup\90 mounted on the web 25 of the an and connected with a pipe 91 which discharges the lubri.-

cant onv theballs, as shown in Fig. 3. lThe groove 20 for the lower. raceway-- is provided with orifices 92 by which the lubricant can be'drained off when desired. Plugs'92* are screwed or otherwise secured in small openings in the web which communicate with the groove 20 which receives oil through holes 92 Vfrom the narrow channel 93 in the bot'- tomof the raceway, as show iiin Figs. 8 and 9. Thus the lower raceway is removable for' the .plugs 92x may be screwed up against it enough to `lift it from its seat in the groove 20. andenable it to be grasped by the hand, this being done in taking the ball bearing apart. AThe bearing18 of the base is alsou i 100 which i'scircular and extends beneath the' screen portion 26, being concentric therewith. The trough receives. the ground material from the screen. Scrapers 101 ad-s lof the same, also preventing the material okeeps it \fre`e from clust and other things.

direcpan beneath the .point wherea the mullers 4exert their grindin action upon said an.

-"to the pan 0, and the springs 45v hay' -paIt by ceiitrifuval fore,lan

justably secured to the an by slot and bolt connections ,102 extend ownwardly into engagement with the bottom of the trough and cause the ground material to be moved out from clogging on the trough bottom. The trough is provided with a discharge 103' from which the ground material is received. The stationary-'bed plate B rests'upon a casing of brick or other masonry, as indicated in Figs. 2 and 3,-A denoting the same, which I have heretofore'referred to as being a bed havingwalls on which the machinery rests. This casing incloses the gearino` and which might clog its free working. Said casing has an opening, as indicated in Fig. 2, through which the drive shaft passes. J The shape 'of the casiigsmay vary '-being either round, hexagonal, octagonal, or. any. 'polygonal form. lt' is found that a dust' proofz casing of this kind for the operating gearing is of great value.

lt is further to be noted thatan importantfeature of my construction consists in locating the .ball -or other bearingionwhich the pan rotates directly beneath the grinding surface of the mullers. Reference to Fig. 3 will indicate that themullers and the ball bearing on which the pan rotates .are vertically in line with each other. There is obviously a great strain upon the wearingplate of 'the pan, and if there were no bearing beneath to take this strain and counteract it, there woulfl f course be a severe tor- '100` sional strain brought to bear upon the p'an and -itsgcentral drive shaft. This feature, of course, is not restricted to any particular l forni of bearing beneath the` rotary an, and i as" t'o this part of the invention, t erefore, 105` -the bearing may be a ball or rotary bearin or any other kind of a bearing, it being o y essential that -it should be located under the The operation o the mill is as-fo lows: By` means ofthe transmission mechanism described, horizontal rotary motion, in the direction of the arrow in Fig. 1, is imparted been properly adjusted to give the require pressure, the material to be ground is thlrown into-the said pan C. That part of the maf terial which is already suliiciently fine will pass through thel screen-plates into the trough, while the lumpy or coarse art be forced by the scrapers 110 on to t e wearing-plate 28 where it is crushed by passing under the mullers W, traveling in contact with said platefand acted on by the springs x" 45. The rotation o. Jthe pan causes the material which has thus .been ground to be thrown to, theu outer screen (portions of the this produces the screening oil of the material, which is sufficiently fine. The 4lumpy or coarse matcrial is returned 'to the grinding surfaces by the stationary Scrapers. Thus by the movement of the pan an intermittent movenient of the material between the grinding and screening surfaces in both directions is obtained and complete grinding to the required degree of fneness insured. During the rotation of the pan, the perforations of the screening surface are kept open by the rotary brushes, which act on the fine material. The scrapers 101 operate to deliver the ground material from the trough 100.

The clay or other material may be easily fed to the rotating pan, and themullers act on a large'amount of material during a given time. These advantageous results are obtained and at the same time the construe tionof the mill is rendered less cumbersome by doing away with heavy grinding rolls. Further, thecombination of the grinding and screening surfaces in `the manner described is of Great advantage as by it the screening is effected by the rotation ofthe grinding surface and a simple construction provided by which the'complete grinding and screening of the material is produced in one operation. And likewise great ease of motion is secured by the use of the ball-bearing I have described, whereby the ower needed to drive the machine is great y reduced.

Many changes and variations may be made without| departing from my invention.

Having thus described my invention, If claim:

l. In a grinding mill, a horizontally rotating web having an upper grinding surface, upright beam-supports upon the outside of said rotary web, ahorlzontal beam bridging and extending beyond said web and surface and connected to rise and fall at both ends in relation to said supports, guides at the opposite ends of the beam, said beam having a .central oblong loop, a grinding wheel journaled to said beam and revolving in said loop, follower springs at the opposite ends of the beam for forcing it downwardly, and cushioning springs for the beam.

2. In a grinding mill, a rotary grinding element, supports parallel to the axis of sai element, a. beam bridging said element and having a central oblong loop from `which its opposite ends extend to overlap andbe supported by said supports, a centrally dis-y posed grinding element fixed to turn within the loop on an axle mounted on and crosswise of said beam, downward forcing springs at the opposite ends of said beam, and weaker cushioning springs interposed between the beams and their supports.

3. The combination with a rotary grinding web and the means for rotating it, of the upright standards arranged in pairs, of beams bridging said web and rovided with suitable bearings, one of whlch beams being supported by`each pair of standards, an-

gular means on the beams engaging opposing faces on the standards, other angular means on the beams engaging other faces on the standards, and grindmg wheels journaled in the said beams.

4. In a grinding mill the combination with the base and the rotary pan having cooperating raceways, of balls running in said raceways, a freely rotatable ring, and rollers rotatably mounted on said ring and interposed between adjacentl balls.

5. In a grinding mill the combination with the fixed base and rotary pan having coperating raceways, of balls runningin said raceways, a ring carrying radial spindles, rollers mounted on said spindles and interposed between the balls, and means for guiding and sustaining the ring.

6. In a grinding mill the combination with the fixed base having a ball-raceway and an annular flange adpacent thereto, of the rotary pan having a raceway to coperate with the first, balls running in said race- Ways, and a ring carrying anti-friction devices interposed between the balls, said ring traveling on said flange of the base.

7 In a grinding mill, the combination with the ixedbase having a ball-raceway and an annular flange adjacent thereto, of the rotary pan having a raceway to coperate with the first, balls runnin@ in said raceways, a ring having radially-disposed spindles, rollers mounted on said spindles and interposed between the balls, and rollers likewise mounted on said spindles and traveling on said flange of the base.

8. In a grinding mill, the combination with a drive shaft and means foractuating it", of a pan comprising a central web secure to saidnshaft,`anV outer screen portion consisting of an annular outer frame set on said web and locked against independent angular movement, said frame embodying inner and outer rims and radial connectin istrips between said rims, and said frame belng divided diametrically into two partsrremovably connected together, Screen sctions set in said frame, said sections being divided from each other radially of the pan, and means on the radial strips engaging seats or recesses in the scrlen sections for connecting the parts toget er. Signed at New York city, this 9th day of March 1907.

EDWARD I-I. CALLAWAY. Witnesses :ey

RICHARD CoNDoN, C. B. SCHROEDER. 

